CN107967200A - It is a kind of based on PCB region temperature detecting come prevent HDD backboards burn plate method - Google Patents

Abstract

This application invents a method for preventing HDD backplane burn-in based on PCB area temperature detection. Determine the appropriate hot spot position at the 12V and 5V power supply positions of the HDD backplane, place a temperature sensor at the selected hot spot position, and pass the temperature The sensor detects the actual temperature of each hotspot, and then transmits the temperature data of each hotspot to the MCU through the I2C bus, and the MCU judges the data and cuts off the power supply of the HDD backplane. Therefore, the PCB material is affected by the ambient temperature and temperature, and the impedance becomes smaller, which leads to the local accumulation effect of heat and causes the problem of local fire on the PCB.

Description

A method to prevent HDD backplane burn-in based on PCB area temperature detection

technical field

The invention relates to the field of server temperature monitoring, in particular to a method for preventing HDD backplane burn-in based on PCB area temperature detection.

Background technique

With the rapid development of the Internet, the continuous rise of cloud computing technology, and the continuous increase of online business volume, the requirements for server stability are getting higher and higher. Since the customer's online business is generally continuous, once the server goes down or the power fails, the business will be interrupted, the transaction data will be lost, and the customer will suffer losses. Therefore, the requirements for the power supply reliability of the server in the computer room are getting higher and higher.

In practical applications, there may be more serious hidden dangers. According to a statistical survey data on client problems, the computer room of the server is generally unattended. Usually, the HDD (Hard disk hard disk) backplane in the server changes due to changes in the ambient temperature and humidity of the board, causing the backplane PCB layer to be damaged. In some positions between the layer and the layer, the impedance becomes smaller and the leakage current becomes larger. With the accumulation of time, the temperature of the PCB will be too high locally, even exceeding the ignition point of the PCB material, which will cause the fatal risk of smoke or even an open flame. These hidden dangers are fatal to the security of the server room.

The existing methods are generally protected by the following methods:

Figure 1 is a schematic diagram of the design scheme for preventing HDD backplane burn-in before improvement. The structure to prevent the HDD backplane from burning includes: PSU (Power supply unit), HDD backplane, the 12V output of the PSU enters the HDD backplane, and is divided into two circuits after passing through the 12V E-FUSE (Electronic fuse): The first 12V supply 12V power supply to the hard disk HDD1\HDD2\...\HDDN; the second 12V is used as DC/DC line: 12V to P5V_HDD input. P5V_HDD provides 5V power supply to hard disk HDD1\HDD2\...\HDDN. The VR line, 12V to P5V_HDD and 12VE-FUSE all have OCP (OverCurrent Protection) protection function. Once the P12V_HDD or P5V_HDD on the HDD side has an overcurrent or short circuit, the 12V E-FUSE and 12V to P5V_HDD will immediately turn off the switch tube and cut off the power supply channel with the HDD.

The disadvantage of the existing safety protection measures is that when the HDD backplane PCB material is affected by the ambient temperature and humidity, the impedance becomes smaller and the leakage current becomes larger, but it is not enough to trigger OCP. Over time, the heat on the board will also continue to accumulate. increase until the ignition point of the PCB is reached. The HDD backplane power supply reliability design before improvement cannot protect against this situation.

In view of the above situation, the present application invented a method based on PCB area temperature detection to prevent HDD backplane burning, which can solve the problem of 12v and 5V leakage on the HDD backplane due to the influence of PCB material by ambient temperature and temperature, and the impedance becomes smaller. The current increases, resulting in a local accumulation effect of heat, causing the problem of local fire on the PCB.

Contents of the invention

This application invents a method for preventing HDD backplane burn-in based on PCB area temperature detection. Put the corresponding temperature sensor, detect the actual temperature of each hot spot through the temperature sensor, and then transmit the temperature data of each hot spot to the MCU through the I2C bus, and the MCU will judge the data and cut off the power supply of the HDD backplane.

Specifically, the application claims protection of a method for preventing HDD backplane burn-in based on PCB area temperature detection, which is characterized in that the method specifically includes the following steps:

Divide the PCB layout into several areas on the HDD backplane, and determine the center of each area;

Determine the distribution area of 12V and 5V power supply, and set the PCB hot spot detection position;

place a temperature sensor at each hotspot location;

Connect each temperature sensor to Re-driver and interconnect with I2C SWITCH;

The MCU is interconnected with the I2C SWITCH through the I2C bus;

Connect a control signal output by the MCU to the enable pin of the PSU to control the 12V output of the PSU;

The MCU polls and reads the data on the I2C;

After the MCU polls and reads, select the highest temperature value and compare it with the temperature threshold set in the MCU; if the actual highest temperature exceeds the threshold, the MCU will send a signal to trigger the PSU to stop working and cut off the power supply.

The above-mentioned method for preventing HDD backplane burn-in based on PCB area temperature detection is also characterized in that there may be multiple PCB hotspot detection locations.

The above-mentioned method for preventing HDD backplane burn-in based on PCB area temperature detection is also characterized in that setting the PCB hotspot detection position is based on the actual layout of 12V and 5V on the HDD backplane, and power supply along 12V and 5V The path selects the appropriate center of the area as the PCB hotspot detection location.

Description of drawings

Figure 1. Schematic diagram of the design scheme for preventing HDD backplane burn-in before improvement

Figure 2. Schematic diagram of the improved design scheme for preventing HDD backplane burn-in

Figure 3. Schematic diagram of hot spots on the HDD backplane

Detailed ways

Figure 2 is a schematic diagram of an improved design scheme for preventing HDD backplane burn-in. The difference between its composition and the scheme before improvement lies in:

Before improvement, set 12V E-FUSE on the 12V power supply channel of HDD backplane.

After the improvement, determine the appropriate hotspot position at the 12V and 5V power supply positions of the HDD backplane. Then place the corresponding temperature sensor at the selected hot spot position, and detect the actual temperature of each hot spot position through the temperature sensor. The temperature data of each hot spot is transmitted to the MCU (Micro controller Unit) through the I2C bus, and the MCU judges the data and cuts off the power supply of the HDD backplane.

The working principle of the improved scheme is as follows:

Divide the HDD backplane layout into several areas as shown in Figure 3, and the center of each area is where the black dot in the figure is located. After the location of the center of the area is determined, according to the actual 12V and 5V actual Layout positions of the HDD backplane, determine the location of the hotspot, which is the location of the hollow circle in Figure 3.

Then, the temperature sensors 1, 2, . . . , N are sequentially placed on the corresponding hot spots. Each temperature sensor is connected to the I2C SWITCH through a re-driver through an I2C. The MCU will poll and read the data on the N-way I2C bus on the I2C.

After polling in turn, the read N temperature data will be sorted, the highest temperature value will be selected, and compared with the temperature threshold set in the MCU. If the actual maximum temperature exceeds the threshold, the MCU will send a signal to trigger the PSU to stop working and cut off the power supply.

Among them: Re-driver is to ensure the transmission quality of the I2C signal and used for signal enhancement; I2C SWITCH is to realize the MCU's access to N-way I2C in turn.

In order to clearly illustrate the implementation of the design method, the implementation steps will be described below in conjunction with accompanying drawings 2 and 3 . details as follows:

1) On the HDD backplane, divide the PCB layout into several areas, and determine the center of each area;

2) According to the actual layout of 12V and 5V on the HDD backplane, determine the distribution area of 12V and 5V power supply, and select the appropriate center of the area along the 12V and 5V power supply path as the PCB hotspot detection position;

3) After the PCB hot spot detection position is determined, place a temperature sensor at the corresponding hot spot position;

4) After connecting each temperature sensor to Re-driver, interconnect with I2C SWITCH;

5), MCU is interconnected with I2C SWITCH through I2C bus;

6) Connect a control signal output by the MCU to the enable pin of the PSU to control the 12V output of the PSU.

Through this connection method, a design method for preventing HDD backplane burn-in based on PCB area temperature detection proposed in this application can be realized.

Obviously, what is shown above is only a specific embodiment of the present invention, and for those skilled in the art, other technical solutions can also be obtained according to the above-mentioned embodiments without creative work, and in this All equivalent changes made within the protection scope of the invention shall fall within the protection scope of the present invention, and all belong to the protection scope of the present invention.

In summary, the present invention detects the temperature of multiple hot spots on the PCB by reading each temperature sensor, and processes these hot spots through the MCU to control the power supply input of the hard disk, so it can avoid the PCB material being affected by the ambient temperature and temperature , the impedance becomes smaller, and the leakage current of 12v and 5V on the HDD backplane increases, which leads to the local accumulation effect of heat and causes the problem of local fire on the PCB. The method is simple to implement, and does not need to be manually guarded in the computer room, which saves costs and improves work efficiency. The technical scheme of the present invention can also be used in other PCB boards such as server main boards, power supply boards, and fan boards.

Claims (3)

1. it is a kind of based on PCB region temperature detecting come prevent HDD backboards burn plate method, it is characterised in that this method is specifically wrapped Include following steps：

By the Layout division of PCB into several regions on HDD backboards, and determine the center in each region；

Determine 12V and 5V power supplies distributed areas, PCB Hot spots detections position is set；

A temperature sensor is placed in each hotspot location；

Each temperature sensor is connected and is interconnected with I2C SWITCH after Re-driver；

MCU is interconnected by I2C buses and I2C SWITCH；

The MCU control signals all the way exported are connected on the enabled pin of PSU, for controlling PSU 12V to export；

MCU carries out taking turn reading to the data on I2C；

After MCU taking turns are read, choose the temperature threshold set in maximum temperature value, with MCU and contrasted；If actual maximum temperature More than the threshold value, MCU will send signal triggering PSU and be stopped, cut-out power supply.

2. preventing HDD backboards from burning the method for plate based on PCB region temperature detecting as claimed in claim 1, its feature also exists In PCB Hot spots detections position can be multiple.

3. preventing HDD backboards from burning the method for plate based on PCB region temperature detecting as claimed in claim 2, its feature also exists In it is according to the layout actual conditions of 12V and 5V on HDD backboards to set PCB Hot spots detections position, is powered along 12V and 5V The suitable regional center of Path selection is as PCB Hot spots detections position.